President Barack Obama toasts with Guinness beer as he celebrates St. Patrick's Day at the Dubliner Restaurant and Pub on March 17, 2012 in Washington, D.C.
Then-Speaker of the House John Boehner, Obama and Irish Prime Minister Enda Kenny walk down the steps of the House of Representatives after attending the St. Patrick's Day luncheon at the U.S. Capitol on March 17, 2015.
Obama, first lady Michelle Obama, Irish Prime Minister Enda Kenny and his wife Fionnuala O'Kelly attend a St. Patrick's Day reception at the White House on March 19, 2013.
Vice President Joe Biden, first lady Michelle Obama and Fionnuala Kenny, wife of Irish Prime Minister Enda Kenny, laugh at a joke by President Obama during a St. Patrick's Day reception at the White House on March 20, 2012.
Obama visits the Dubliner Restaurant and Pub in celebration of St. Patrick's day on March 17, 2012 in Washington, D.C.
Michelle Obama and Biden attend a St. Patrick's Day reception in the East Room of the White House on March 17, 2011 in Washington, D.C.
Obama talks to then-Speaker of the House Nancy Pelosi after the annual St. Patrick's Day Capitol Hill luncheon on March 17, 2010 on Capitol Hill.
Presidential hopeful and then-New York Sen. Hillary Clinton greets supporters during a St. Patrick's Day Parade on March 15, 2008 in Pittsburgh.
President George W. Bush walks with Irish Prime Minister Bertie Ahern and then-first lady Laura Bush at the White House for a St. Patrick's Day celebration on March 17, 2008.
Bush walks down the Capitol steps with Pelosi after a luncheon for Irish Prime Minister Bertie Ahern at the U.S. Capitol on March 17, 2008.
Vice President and Democratic presidential hopeful Al Gore, right, walks in a St. Patrick's Day parade with Chicago Mayor Richard Daley on March 11, 2000 in Chicago.
Then-first lady Hillary Clinton greets a baby as she marches in the St. Patrick's Day parade on March 17, 2000 in New York City.
Former President Bill Clinton accepts a bowl of Shamrock, the traditional symbol of St. Patrick's Day, from Irish Prime Minister Bertie Ahern during ceremonies on March 17, 1998 at the White House.
Republican presidential candidate Sen. Bob Dole and Wisconsin Gov. Tommy Thompson celebrate St. Patrick's Day on March 16, 1996 in Madison, Wisconsin.
Late President Harry S. Truman (1884-1972), left, and former Gov. Thomas E. Dewey (1902-1971) meet at New York's St. Patrick's Day Parade on March 17, 1948. Both were presidential candidates that year.